Injection valve capable of preventing oil dripping after injection

Abstract

The utility model discloses an injection valve for preventing oil dripping after injection, which relates to the field of injection valves and comprises an injection valve body, an oil supply port, an oil nozzle and an air inlet channel are arranged on the injection valve body, and the air inlet channel is connected with an air supply device for supplying air to the injection valve body and a vacuumizing device for vacuumizing the air inlet channel. When the injection valve stops injection, the air supply device stops air supply, the vacuumizing device starts to work at the moment, air in the air inlet channel is pumped out instantly, the air in the air inlet channel is changed into negative pressure immediately, the external pressure of the oil nozzle is larger than the internal pressure of the air inlet channel at the moment, and residual lubricating grease in the oil nozzle does not overflow out of the oil nozzle any more. Therefore, waste and environmental pollution caused by overflowing and dripping of lubricating grease of the oil nozzle are avoided, the structure is simple and convenient, use is convenient, the newly-added cost is low, waste of the lubricating grease is greatly reduced, and meanwhile environmental pollution cannot be caused.

Description

Technical Field

[0001] The utility model relates to the field of injection valves, and particularly to an injection valve for preventing oil dripping after injection. Background Art

[0002] In the prior art, the injection valve first reaches the position of the injection valve nozzle through the oil supply channel. At the same time, the one-way valve pushes the ventilation channel to open, and the gas in the pipeline reaches the nozzle position. The high-pressure gas sprays the lubricating grease to the place that needs to be lubricated. However, after one injection is completed, although the gas source stops supplying gas, due to the residual pressure of the gas in the pipeline, the gas that has not been completely depressurized in the injection valve will still push the remaining lubricating grease in the valve body to continue to overflow from the nozzle until the gas pressure in the injection valve is completely gone, and the lubricating grease in the valve body will stop overflowing. At this time, the overflowing lubricating grease may fall under the injection valve at any time, causing waste of lubricating grease and environmental pollution. Summary of the Invention

[0003] In view of this, the purpose of the utility model is to provide an injection valve for preventing oil dripping after injection.

[0004] The injection valve for preventing oil dripping after injection provided by the utility model adopts the following technical solutions:

[0005] An injection valve for preventing oil dripping after injection includes an injection valve body, on which an oil supply port, an injection nozzle and an air inlet channel are arranged. The air inlet channel is connected with a gas supply device for supplying gas to the injection valve body and a vacuum pumping device for pumping the air inlet channel into a vacuum.

[0006] Further, the gas supply device includes a gas supply pipeline communicated with the air inlet channel and a gas supply equipment.

[0007] Further, a one-way valve is arranged on the gas supply pipeline, and the one-way valve is used to prevent the vacuum pumping device from pumping the gas supply pipeline into a vacuum.

[0008] Further, the vacuum pumping device includes a vacuum pumping pipeline communicated with the air inlet channel and a vacuum generator.

[0009] Further, a throttle valve for controlling the degree of vacuum extraction of the vacuum generator is arranged on the vacuum pumping pipeline.

[0010] In summary, the present utility model includes at least one of the following beneficial effects: when the injection valve stops injecting, the air supply device stops supplying air. At this time, the vacuum pumping device starts to work, instantaneously evacuating the gas in the air intake passage. The gas in the air intake passage immediately becomes negative pressure. At this time, the pressure outside the fuel injector is greater than the pressure in the air intake passage, and the residual grease in the fuel injector will no longer overflow from the fuel injector, thus avoiding the waste and environmental pollution caused by the overflow and dripping of the grease from the fuel injector. The structure is simple, easy to use, the additional cost is low, the waste of lubricating grease is greatly reduced, and at the same time, it will not cause environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model.

[0012] Description of the reference numerals:

[0013] 1. Injection valve body; 11. Oil supply port; 12. Fuel injector; 13. Air intake passage; 14. Tee joint; 2. Air supply device; 21. Air supply pipeline; 22. Air supply equipment; 23. Check valve; 3. Vacuum pumping device; 31. Vacuum pumping pipeline; 32. Vacuum generator; 33. Throttle valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following specific examples illustrate the embodiments of the present utility model. Those skilled in the art can easily understand the other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0015] The following is a further detailed description of the present utility model in conjunction with the attached Figure 1 drawings.

[0016] An embodiment of the present utility model discloses an injection valve for preventing oil dripping after injection. Refer to Figure 1, An injection valve that prevents oil dripping after injection includes an injection valve body 1. A fuel supply port 11, an injection nozzle 12, and an intake passage 13 are provided on the injection valve body 1. The intake passage 13 is connected to a gas supply device 2 for supplying gas to the injection valve body 1 and a vacuum pumping device 3 for evacuating the intake passage 13 to a vacuum. When the injection valve body 1 stops injecting, the gas supply device 2 stops supplying gas. At this time, the vacuum pumping device 3 starts to work, instantaneously evacuating the gas in the intake passage 13. The gas in the intake passage 13 immediately becomes negative pressure. At this time, the pressure outside the injection nozzle 12 is greater than the pressure inside the intake passage 13, and the residual grease in the injection nozzle 12 will no longer overflow from the injection nozzle 12, thus avoiding the waste and environmental pollution caused by the overflow and dripping of the grease from the injection nozzle 12. The structure is simple, easy to use, the new cost is low, the waste of lubricating grease is greatly reduced, and at the same time, it will not cause environmental pollution.

[0017] In this embodiment, a three-way joint 14 is provided at the inlet of the intake passage 13 of the injection valve body 1. The other two joints of the three-way joint 14 are respectively used to connect the gas supply device 2 and the vacuum pumping device 3, which can ensure that the gas supply device 2 for promoting the injection of grease and the vacuum pumping device 3 for evacuating the intake passage 13 to a vacuum are simultaneously connected and can be switched at any time through an electromagnetic valve.

[0018] In this embodiment, the gas supply device 2 includes a gas supply pipe 21 connected to one of the joints of the three-way joint 14 and a gas supply device 22. When gas supply is required, through the switching of the electromagnetic valve, the passage of the vacuum pumping device 3 is closed, and the gas supply device 2 is opened. The gas supply device 22 supplies gas to the intake passage 13 through the gas supply pipe 21.

[0019] In this embodiment, a check valve 23 is provided on the gas supply pipe 21. The check valve 23 is used to prevent the vacuum pumping device 3 from evacuating the gas supply pipe 21 to a vacuum.

[0020] In this embodiment, the vacuum pumping device 3 includes a vacuum pumping pipe 31 connected to one of the joints of the three-way joint 14 and a vacuum generator 32. When the injection valve body 1 stops injecting, the gas supply device 2 stops supplying gas. At this time, the vacuum pumping device 3 starts to work, instantaneously evacuating the gas in the intake passage 13.

[0021] In this embodiment, a throttle valve 33 for controlling the degree of vacuum extraction of the vacuum generator 32 is provided on the vacuum pumping pipe 31.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An injection valve for preventing oil dripping after injection, characterized in that: The invention comprises an injection valve body (1), wherein the injection valve body (1) is provided with an oil supply port (11), an injection nozzle (12) and an air intake channel (13), wherein the air intake channel (13) is connected to an air supply device (2) for supplying air to the injection valve body (1) and a vacuum device (3) for evacuating the air intake channel (13).

2. The injection valve for preventing oil dripping after injection according to claim 1, characterized in that: The air supply device (2) comprises an air supply pipeline (21) and an air supply device (22) which are in communication with the air inlet channel (13).

3. The injection valve for preventing oil dripping after injection according to claim 2, characterized in that: The air supply pipeline (21) is provided with a one-way valve (23), and the one-way valve (23) is used to prevent the vacuum device (3) from evacuating the air supply pipeline (21) into a vacuum.

4. The injection valve for preventing oil dripping after injection according to claim 1, characterized in that: The vacuum extraction device (3) comprises a vacuum extraction pipeline (31) connected to the air inlet channel (13) and a vacuum generator (32).

5. The injection valve for preventing oil dripping after injection according to claim 4, characterized in that: The vacuum extraction pipeline (31) is provided with a throttle valve (33) for controlling the degree of vacuum extraction by the vacuum generator (32).

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